They're air-filled (I assume. A lot of the other old Kossphones use air-filled pads., and meant to have only air-filled pads I can assume. Anything else and there's likely be a bass drop-off. Those air filled pads seal like crazy. But yeah, homemade pads would work at worse case. Koss MIGHT have pads for them though. You can ask. They still have pads for the ancient HV-1's, so you might get lucky.
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